16 Clock & Watch Winding Keys 14 New Pocket Watch Winding Keys. This is a new set of 14 pocket watch keys. These keys are used for winding pocket watches. You receive: One 00 size watch winding key. One 0 size watch winding key. One 1 size watch winding key. One 2 size watch winding key. One 3 size watch winding key. One 4 size watch winding key. One 5 size watch winding key. One 6 size watch winding key. One 7 size watch winding key. One 8 size watch winding key. One 9 size watch winding key. One 10 size watch winding key. One 11 size watch winding key. One 12 size watch winding key Two 5 Sided Clock KeysThis is a new set of two 5 sided clock keys.The sizes are: Size 2, 2.75 mm. Size 3, 3.00 mm. Size 4, 3.25 mm. Size 5, 3.50 mm. Size 6, 3.75 mm. Size 7, 4.00 mm. Size 8, 4.25 mm. Size 9, 4.50 mm. Size 10, 4.75 mm. Size 11, 5.00 mm.